Club boost

Hello.
I really appreciate the archetype system, but I would have preferred a single leveling system for all archetypes.
But that's not what I want to ask :) 

There are people, like me, who have to level up multiple archetypes to help the team.
Boosts, such as 6x, are a huge help.
Why can't I buy as many as I want?

I only play club, I don't play fut, I want to spend my FIFA points on club.

Why can you buy as many packs as you want on fut and they are limited on club?

My suggestion, of course, is to be able to purchase an unlimited number of boosts.

Thank you.