To be honest, I am waiting XBC to go to MP, if ever can make it to MP despite ENERGYcoin or other coins going fast, I will sell all of my XBC stash at one go. I know most of people here, maybe %99 is also waiting for this. That is why XBC price will not increase I think.
Unfortunately that is the real problem. The devs didn't add any value to the coin and of course vanishing didn't exactly help matters either. The new team doesn't really have time nor funding to do much in the meanwhile.
I expect the best time to sell will be before it hits MP, a week before it should get listed. Although of course if everyone thinks that same way, perhaps not. I guess just look for those seemingly random pumps that occur on Polo, which appear to be working less successfully each time they try it.