There's this dude whose results are already about as good as this new dude's plus this other dude is gonna come out with a totally rad new set of results so you should just wait for those bro.

If your GWAS has more people, the results are more accurate, and you can detect smaller effects, finding more SNPs that do something. The CTG study had 78,308 people in it, the SSGAC study will have 1,000,000.