Hello, I'm Flowingcloud from Yado Inn, Ebisu Translations, Kirara Scantasia and many other groups.
This is mostly used for accumulating funds for raws that I buy, mostly manga raws. A digital tankoubon (see Wikipedia for meaning) costs usually around $8-10. Physical magazines that I currently subscribe to cost around $85 a year each (a total of two magazines). I use the physical copies to give you the latest chapters as soon as possible instead of waiting for the tankoubon.
Update: This is also for donating for God of Cooking and other novels!
Whether you donate or not WILL NOT affect my scanlation or translation speed. It's just nice to help split the costs.