upstore is good as single host for one reason which is simple u wont find upstore premium easily on rapidleech services whether small or giant . so such host is good if u have unique (i mean not easily avlaible stuff on net) and so it brings good sale then. else u find ur stuff eaasily downloaded by rg or ul if they r ur 2nd host bz many people have their premium .... and its more good to put files to premium only if u have ur own blog .. see if some people leave ur site for premium only sake beleive it or not they were never goin to buy premium in any case ... so they left for good
and ya for such host if u use them as single try to backup ur files on some other host where atleast u can reup ur files if in case the single host die . it may consume a week of urs incase ur host die but revenue generation is good that way if u intent to just make money ... If u work things as ur hobby then it really just doesnt matter much if u have bit of less sales ..