I think this is a serious issue and should be addressed by the Bitcore team somehow (a statement to introduce the other existing pools to the community, contacting other pool owners to add Bitcore to their pool, etc.).
I was mining with all my rigs there in the past, but for the past two months or so, I have pointed 2/3rd of my BTX rigs to UMine and the remaining 1/3rd to Omegapool to have a part in distributing the hashrate (however small it might seem compared to the total network hashrate).
Omega has higher hashrate and higher fees, but I didn't abandon it completely because I heard that it is owned by one member of the Dev team and I thought that this way I can support the project too.