I understand your concerns with the dev just leaving which I hope never happens
Dev hasn't signed in since Feb 26th and all we have heard for 2 years is vague promises of "something" being developed behind the scenes.
At this point I already consider XPTX abandoned until proven otherwise.
This is never a good sign, but there is no significant volume = no significant dumping... so XPTX remains an enigma.
In terms of hi yileld coins, I prefer VULCANO with decent volume and 2 exchange listings.