어도 쓰다

even if X, there's no use

A concessive "-아/어도" (even if, even though) landing on 쓰다, so the sentence weighs whether something is usable despite some condition. Most lines here say there is no point: even if you own it there is nowhere to use it, even if you learn Spanish you'd have no occasion to use it. Others go the positive way — there are deals you can use even if you don't live in Britain, and you can still use it years later. Note that 쓰다 covers both "use" and "write", and the username quoted in one line plays on the writing sense.