Yes, i'm agree with you. there are some legit sellers, which can identify fake cakes, and have a good choice from the 8-10 tea major's. For avoid bad sellers, i use some simple rules: never choose a seller who sells only 50 or 100 teas, among whom the classics fake bricks or tuocha (it means they doesn't have any qualms selling you crappy stuffs they calls "tea"), and never the sellers who use non personnal pictures. Then you have a good chance to find correct teas to drink everyday. And sometimes good suprises.
About Acupspring Tea Co Ltd, he haves more than 1000 pu'er, fakes, but also authentics. I would not take the risk of shopping for a Dayi in his shop, but he's good for less famous tea which can be buy to drink everyday if you are too short in money to buy middle range tea. Another one i NEVER had any problems: CHINA GRANDNESS TEA CO, LTD This is a good shop for teas from Major's
For good, very good, or great tea, i use the Teachat vendor's guide. And this is perfect!!
ps: about DTH, i had just heard about a fake gold Dayi by a member of this board. But there he's ranked as a reliable seller. So... if someone knows something else about him, it could help