Maybe 1/4 of an XP for each vote on the average is a bit much, certainly for the higher levels. Perhaps some decreasing scale might balance it more.

Giving 2 +1/4 number of available votes for your level XP points once a day just for logging in, seems a bit overdone as well, if you ask me.

It would be too easy to automate that.

Other suggestions:

• put a daily limit on the number of XP you can gain by methods other than people voting on your nodes;
• do not show immediately the XP gains when they happen, but build it into the Fairy's routines.