Cry havoc! And let slip the pigs of war!
Aren't you then selecting the participants rather than it being self-selecting though? I.e. you start with a representative sample, and then simply have to get their opinions.
FFS! I did not read all of the responses…seeing them now. This is probably redundant….sample if randomly selected would potentially be representative
In a study, the problem can be a selection bias.
I am not saying this is true! But let’s pretend a bigger proportion of fans are in an age or cultural group that does not use computers much.
If you pull your sample via online/computer your sample would not be a representative one.
Again, I don’t think that is an issue itself here just using for illustration! But to your question, even a large sample could be a poor one if it is biased.
With appropriate sampling, you could have a much much smaller sample than this be a good representative one.