20K seems high to me....but it's not my money.
Especially when, by standing in Kentucky, you are basically subject to open level stakes in the sire stakes programs. So all of Karl's offspring are restricted to Kentucky's stake program, which is plenty good until you take into consideration so are any of the other jurisdiction sires' progeny are, dependent on residency of mare. Yes, you are eligible for quite a bonus, but you've got to be good enough to beat them (or at least be competitive). And his will need to be competitive with Walners, Muscle Hills, Chapter Sevens, etc.
Are there additional perks to being solely Kentucky-eligible that I am not aware of?