I'd have to imagine it wouldn't be too hard for them to do if they're in a project and the cabs are already mic'd up to shoot some IR's. With the industry changing and making money on the recording side (i.e. companies, producers, studios etc) it'd be an opportunity for extra revenue streams for minimal effort, though it may be $40 or so dollars a pop it can add up, especially as demand increases.
You would be surprised how much time it takes to produce a decent cab pack.
What works for one song and one band may not work for another mix with another band. For example Eddie Kramer is famous for his notebook full of the tried and true mic choices with positioning, cabinet, guitar, style, mic preamp, sometimes compressor, and board EQ combinations. Yet he still needs to experiment from time to time to serve the needs of the song and mix after so many years in the biz.
Since studio time is money that is usually paid for by the label and/or band; either party is usually not too keen for Producer A to spend several hours sending frequency sweeps through an artist's beloved cab. Some studios get downright nasty when you suggest capturing their cab in such a way, unless they get a royalty on the sale. As many studios view ir capture process as cutting into the potential studio booking time revenue, if their cab is out there for X dollars buyout price versus so many dollars per hour/day/week/month to block out the studio to record that cab per artist, they sometimes fear it makes their business model even more endangered than it currently is.
If the producer even gets the OK to use the particular cab, then it takes a lot of time per mic position per speaker to find the "right" one. Whether you are doing 3 or 5 or 8 mic positions, you multiply that by at least 5 different trial and error positionings that you have to review for sonic quality, multiplied by the number of speakers in the cab, multiplied by the number of mics used to capture the cab, multiplied by the time used to test for phase coherency between captures, and you can rack up a lot of money in studio time very quickly. Even if you run and gun shooting ir's at the studio blindly, and review them at a home studio, then there is the time spent by a producer to review those ir's to winnow them down to the winners (which is taking him away from other projects with billable hours), as well as the danger that one position's options are not optimal and you have to go back reshoot that position on that cab in yet another way with a particular mic and all the logisitics/money that goes into that.
If the producer is using a home studio space, unless the hand of Zeus touched the space with optimal acoustics for ir capture, which may be different from a producer's usual acoustical recording requirements depending upon style/taste, then there is the cost to treat that space that must be recovered in an amortized way along with any mic purchases and/or rentals.
No matter how many options you capture, there is always a potential customer base who will desire yet another mic choice, mic positioning, post processing, power amp , mic pre, speaker variety, or even variety of cabinet you did not use as a desired make or break choice required to purchase your cab pack.
If you capture too many options, then certain customers feel bewildered or intimidated by the amount of options and will not purchase the cab pack as they will feel that they are being lead down a rabbit hole of time wasting on their part auditioning options that won't work with their particular guitar, amp, style, genre, band arrangement, mixing aesthetic, or song choice. To try and predict all those options proactively for a potential customer can bend one's mind, since one size does not fit all in most use cases
And the producer is taking the fiscal risk to recoup all of the above based on a certain break even point of sales, which may or may not happen.
If you compare this effort to a traditional flat fee plus points on a project that a big time producer usually gets or the usual rates that a studio commands, then you understand why many of them shy away from this type of project. It truly is a labor of love for all of us who do it.
So "minimal effort" is usually not really minimal effort if you start adding all this up.
