A wise man once said "A true master is an eternal student"...
More seriously, some collectors may have more experience than others, that's true.. But, in my opinion, a collector who spent thousands in his collection may be advanced... or not. You may spent thousands of dollars in expensive coins, and have tons of scarce coins, if you know nothing about their story, their design,... then you are not an advanced collector, you are just rich. (I do not blame rich collectors, just saying that money is totally different of knowledge!).
Read books about your area of collecting, know your coins, learn how to differentiate the variants,... Even if you have a few cheap coins, I will consider you more advanced that a "brainless rich".
Another thing is that, you may be "advanced" in a defined area, even if multiple areas of collecting, but there's always coins you struggle to even know what they are, there's always a country you've never heard of, a new variant previously unseen, or a part of history totally unknown to you...
An advanced collector is an eternal beginner...Never stop learning.
A bit like Zoro actually, he knows he's strong, but he keep training anyway, even if he's stronger than most of people. Advanced collector and best swordsman, same fight.