I am a new collector myself but I totally disagree with “collect what you like and eventually everything will come around” advice if you are only looking for investing.
What you like and investing got nothing to do with each other unless what you like are those popular pokemon like charizard, lugia, etc.
For example, if you like caterpie and weedle and only collects them for the next 5years. Your investment dont really worth anything. So how does collects what you like in this case helps? (Sorry to the caterpie/weedle investor out there)
Collect what you like is mainly for collectors 1st and investment 2nd. Its not meant for investor 1st mindset.