This site, flairs.championmains.com, is currently run by /u/LugnutsK (Mingwei Samuel). The site costs about 850 USD a year to run. Any money given will go to paying those costs and maintaining and improving the site.
Note that PayPal takes 0.30 USD and 2.9% of money sent if a credit or debit card is used. There is no fee for sending directly from a bank account or PayPal balance though.