When you say the whole collection, I assume you are including the weird one that came up when the Robotech Game came out? VF-1R wasnt it called? Ugh. I dunno. I just think that was fugly. I have the MPCs but not that one since I dont consider it as the collection to the Robotech series. I guess to each their own.
Anyways, your collection is what you make of it. Do what you like and what you want to do. Dont let anyone dictate your collecting. If you feel it is too much, then by all means sell some. Just make sure you will not regret it. I had extra MISB MPCs and I sold them and I got my money back. If I kept them, I coulda made more money on the Rick Hunter but I would not have sold the rest possibly. All in all I think came out ahead.