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It sounds good to me! It is exactly the way I do it also!
I don't see why a monthly block of hosting is any different to a monthly block of newspaper or TV Ads. It is a form of advertising IMHO :)
Hosting is a cost we incur to generate new business ...... hence it is Advertsing :)
My accountant did make a case for it being equipment rental...but, I didn't much like that option!