roughcaster
I dont know if you tile but 90 per cent of my work is via reccomendation.
Your ignorance will be your downfall
I do tile, and plaster and roughcast, and render etc etc and have done for years. My work comes from recommendation too. But just because I don't know of a product that can make bodged up floor grout look good, means nothing to me, i've never needed to buy it. If a jobs done right in the first place, it shouldn't require extra expense. The downfall of anyone is bad workmanship, and secondly, thinking you know it all.
Roughcaster.