Oh, Inigo knows exactly what Tidus means the moment the other says that. It takes so very little time for the realisation to dawn in his eyes, and then for the surprise to be replaced by something closer to refusal a second later.

Even though he doesn't use the word, every single bit of body language Inigo is showing off right now is just screaming dude!

"We can't spend that many points on something we'd just tuck away forever!"

Also, he's probably wearing embarrassing poofy pants on it, please!!