I find it bizarre that you're so interested in which parks I visit, but I'll explain nevertheless.Thorpe, to me, is average at best, however as a theme park fan I'm thankful to live fairly near to a major park, and it makes sense to use the facility, especially considering that I actually enjoy the majority of the rides there.
Alton is completely different for me as it requires a lot of forward planning around other commitments, and when combined with the petrol cost involved and booking somewhere to stay, it actually adds up to a considerable amount of money (and time). It comes down to whether it's actually worth that time and money involved with visiting, which with six rides closed, it's probably not, and the money could be better spent on other park trips.