As my friend Chris often says about his site, we’re in it for love, not money.
And Rob helped me in an uploading crisis. (My connection here is so slow sometimes that I go out for coffee and return and it is still loading a page!) I'm not putting a link for Rob here because I don't want him to get swamped with requests for help.
So what’s the “purity” about? Visual purity - one less thing to clutter up the site.