You only use a limited number of Tier 1 advancements as they become less useful as players get more buying power; so as the game progresses they eventually get replaced with more tier 2 options.
Using fewer tier 2 and 3 options would just mean you would run entirely out of buying choices, which wouldn't be much fun.
I agree that limiting the level 2 and 3 options would be a bad idea, but I'm not entirely happy with the card limits to level 1 in the base game either.
I find that the total number of cards for level 1, especially when the new expansion is added in, can severely limit early synergies and create balance problems.
Part of the problem I believe is that the "deck fixing" level 1 cards are almost always inferior to income generation and vale symbols. It doesn't seem to be a problem if there are only one or two of those cards in the mix, but if the level 1 set is heavily weighted towards deck fixing then it seems the lucky player/s that is able to buy the income cards has a leg up.
Does anyone else feel this is an issue? Maybe it has been discussed before and I just didn't see the thread. I have toyed with a few variants to fix the issue, just upping the numbers to something like 15,18,20 can help the problem. Although I am leaning towards just removing 1-2 copies of the cards I think are much weaker.