The profits obtained will not last long if people continue to join, because the number of people there increases while the stock remains so, there will be a reduction in the prize portion.
especially if suddenly the results drop because the number of people continues to increase.
Well in my own opinion I think there is a benefit to join mining pool in their early stage, reason is because if you start from the day one I think before people will think of joining the mining pool I'm pretty sure you must have make alot of profit either.