Please understand that it eats resources....and with 8MB blocks with 56tx/s it is going to eat a lot of resources then it does now with 7tx/s. 56tx/s is only an 8MB block while the proposal is to upgrade the blocks every year (!). When Electrum server does not get its resources it needs to proces the blocks it will start lagging and lagging....a simple VPS like we have them running on now will not keep up.
Read this
http://www.reddit.com/r/Electrum/comments/38qi2m/20_mb_blocks_the_end_of_electrum/I am aware of the current block size discussions and I know perfectly well the kinds of resources a full node/supernode/Electrum node consumes.
To start off, the block size change hasn't been made yet, and even if the client accepting bigger blocks is released right now it will require full consensus of the network, and even then the change might not be immediate, as you may know.
When the change does materialize blocks will not be immediately full (not all blocks have 1mb in size as of now), but they will gradually increase their size with the rising adoption of Bitcoin (we sure do hope the adoption rates increase in the next few years!)
Meanwhile, while these changes occur, storage, RAM and bandwidth get cheaper; this results in cheaper and better VPS services.
Yes, running a node is hard. Yes, running a node is costly. Yes, running a node will probably be more costly if Bitcoin really picks up. Yes, requesting a compensation to use high performance nodes might be required (although I still think running a node of whatever kind should mainly be a community service based on the blockchain and the currency's value). But it's very premature to request funds that will be used in an uncertain future. It may take a few months for block to fill up... or it can take 10 years. the problem exists, but it's still premature to talk about raising the bar way higher.
Sorry for the lengthy post, but this is my opinion. I hope I made my point clear
It's premature to trust Electrum node owners with funds for upgrades.
EDIT:: as an alternative, you can try and get a deal with an escrow for storing the donation coins for an uncertain amount of time. There may be escrow services willing to help on something like that.