Why not buy from a wholesaler in Houston?

[Cory Boren]

I was at a large networking event recently and the Speaker/Guru investor told everyone not to buy over 75% of ARV in Houston. I understand that those who can spend 10-20k per month on advertising have to buy at those % to make sense. Why not let the wholesalers do the research, spend the $ on advertising, and buy from them. If an investor only has to analyze the deal and buy as many properties as he/she can afford then why not pay the extra %. 10 deals per year @ 80% are better than 3 deals a year @70%. Any comments on why someone would not want to use a wholesaler would be greatly appreciated...