Why is my bill $10 more this month?
From HostBaby Wiki
If we are your domain registrar (meaning, if we registered your domain name for you) then there will be a $10 charge, once-per-year, to renew your domain name.
Domain names are leased for a period of one year. You pay us, we pay the registrar on your behalf. Because we register lots of domain names every year, we get a nice discount and we pass that on to you.
So the $10 fee keeps the domain under your ownership for an additional year and is tacked onto your hosting bill the month after it's renewed.
Don't worry, we'll always notify you well in advance of the unlikely event of a rate increase. :)