It can be cheaper to host own (desktop-grade) hardware instead of paying someone to host a stupid single website. The calculation is easy, especially if you only take into account electricity and not hardware purchase costs:
Monthly costs per watt are around 0,3EUR/kWh * 24h/d * 30d/m/1000 = 0,2EUR. That's roughly the price tag for keeping a raspberry pi on 24/7 (yes, it's below 0,2EUR/month). For an average desktop/laptop, which will consume way less then 30W in idle, it's 6 EUR/month. The price of an average hosting offer.
Agree.. I ran a home-hosted web site with regular traffic on a Raspberry Pi 2B for a couple of years before upgrading it to a Pi 3. If you get power issues you can always switch to a battery power bank for a while (assuming your router doesn't go down at the same time).
Monthly costs per watt are around 0,3EUR/kWh * 24h/d * 30d/m/1000 = 0,2EUR. That's roughly the price tag for keeping a raspberry pi on 24/7 (yes, it's below 0,2EUR/month). For an average desktop/laptop, which will consume way less then 30W in idle, it's 6 EUR/month. The price of an average hosting offer.