Apart from all of this--no, there is no limit--go ahead and plunk down the 30 bucks and get a type-3 FFL.
Then, when 'do-gooder' thinks they can quote chapter-and-verse of laws that don't exist----you can produce your nice 'Federal License' to make them shut their gob. You can be right and let them know they are dead WRONG--or, you can have things go YOUR way at days end.
Certain types of fools are fools who have authority and no one likes to have their nose rubbed in the truth--especially the world's petty tyrants.
Sometimes, you pick your battles--and for 30 bucks you too can become an FFL-3; a bona-fide collector with a suitable-for-framing fed-gov document that impresses the most numb skulled and leaves them feeling warm and fuzzy about the fact that you own 15 + guns, etc.