If you look back at 2017 pump it was average users like us who got the benefit of bull run as Bitcoin was easily affordable before the bullrun hence a good portion of users had bitcoin in their portfolio as there were not that much altcoins available in the market.
Bitcoin's can't be more affordable or less affordable, the minimum investment amount is so small that it's not going to be a problem ever. In 2017 any investor, big or small, could double their money withing months or even weeks and days in the later stages. The same is happening now - Bitcoin went from 10k to 40k, and everyone has equal access to it.
The recent google trends data shows that retail investors started joining at around $35,000, though of course they were always present on this market. Overall it's still the individual investors who are winnings the most, as those are the people who hold the most coins.