Ages ago, I sold all my lower tier pets weapons and just battled with Craggy, he's tier 11 going on 12, I looked at my other pets today and one is so close to tier 7 that I thought Id get some weapons for her and level her up, I bought 4 items it cost less that a million sp, and its great fun again! I often wondered why other people level up all their pets but now I understand, because its fun! [and cheap-ish]
LOL that and when it comes to events and stuff, getting extra loot is always rewarding. c: Happy battling with your pets~
Plus buying CS challengers is so much more worth it when you can get exp on multiple pets!
I didn't really like having extra pets before (Chums was all I needed!), but it's nice to take them into the BC and see how far casual training has gotten them.
And the extra loot doesn't hurt either.
I only had 1 pet for a long time, and now Ive got 8, they seem to appear like magic! most of them are tier 1, so Ive got a set for them, it must have cost 50k. And we're having lots of fun.