@Snoops I think some people just prefer being on a Pool, income is regular and in some ways easier to get going. Looking at JPV8- history he's been Mining Burst since 2014, has always mined on a Pool and was for a lot of time on the Italian Pools, so I guess he just likes Pool Mining and fancied a change.
You are lucky to have him as bustcoin.biz blocks are a bit few and far between and he seems to be making a significant contribution. :-)
Rich