For a few reasons:

1. You may have noticed that the site is incredibly fast that is because it is hosted on first-class business servers which is not cheap.
2. All the videos of the venues are hosted with Vimeo a remote video streaming service also quite expensive and the more the site grows the more those costs increase. Yes I know you tube is free but the videos are poorer quality and covered in ads, vimeos are not.
3. Like all websites I need to advertise every now and again that too costs money.

I aim to keep this ite free and donations and a few commissions I make from the ads cover the costs so you don’t have to pay a monthly membership fee.