There aren't any official policies yet ... we're talking about it. The Community is largely self-monitored (not to discount the work that Tim, etc., do here!); but that means anyone can flag a post as abusive or spam, etc.. So I don't know if there's been a run of flags for any particular reason or if I've crossed the invisible line.
I completely empathize that we don't want to have the Forum become too commercial, and certainly not "spammed"; but SmartTiles has no other options for exposure besides here and word-of-mouth (and a few social media followers). So I can't afford to err on the side of shyness.
Someday when there's a "paid Marketplace", then I presume there will be reciprocal advertising and promotional agreements in place. That's where we know several Community developed SmartApps and Device Type Handlers belong. Yet ... can't hold breath.
I definitely don't hold anything against the "sellers"; we currently consider SmartTiles to be an extended "proof of concept" until some point in the future when we will extensively test and release a product of "commercial quality". Just today, someone asked how best to promote SmartApps for sale ... truth is, we don't know; ... the most obvious answer is via the SmartApp Marketplace (?) and via a reasonable number of Topics and "in-context" posts, I guess.
We're finding that SmartTiles is receiving about the "industry standard average" amount of donations. I'm not disappointed; though I lean towards emphasizing that we are in the age of crowdfunding, and that sets up a whole new set of expectations and ... rules? SmartThings, itself, is the result of successful crowdfunding. So I presume they remember those humble roots.
We'll figure it out...
Back to our regularly scheduled programming...