I used to live in a new build block of flats that was mostly buy to let - it was actually still being built at the time and I was amongst the first to move in.

I used to live in a new build block of flats that was mostly buy to let - it was actually still being built at the time and I was amongst the first to move in. I wanted high speed broadband but it was quite expensive at the time (8mbit was about £50/month back then) but I was close enough to the exchange to get it. I bought a wireless access point, set myself up as a linksys reseller and sold WRTs to most of my floor offering unlimited Internet access for £10/month. I then used a Linux box as my gateway for the wireless, split everyone off from my internal network and throttled connections based on the amount they paid. When new people moved in I came round to see them (usually with a pre-configured router) and offered them 12 months (as that's how long most tenancy agreements were) for £100 plus £50 for the router. I ended up having 5 8 meg ADSL lines and almost the entire block on the network, each getting 512k-2mbit for £10 a month and a nice profit margin too!