I like the idea. I gladly paid for DDO each month which encouraged consistent updates, tweeks, and perks. But there is something I have never understood....why do I not see FS littering other gamer-specific sites....nor Eldevin for that matter.
FS has the distinct advantage of positioning itself as a "retro" MUD game, therefore doesn't have to be cutting edge and can survive as long as they have interest (similar to the resurgence of Atari style games for the iOS).
We could well see the day the daily population is up over 2000, but advertising is key on HCS' part.
DP
Been shouting about advertising for over a year. Agree 100%.
As to the subscription, as long as actual tangible gameplay boosts aren't included (the potion aspects I'm not favorable of) as Pardoux cited it should be a nice secondary aspect for people to visibly cite they are supporters of the game.
Bio space was cited at one point in the past year would be increased the allottment for upgrades.... but thus far nothing. There's one thing right there that would definitely add something.
Also I like the allottment of a FS Box post per day alottment. Maybe a icon under your guild rank and guild name like HCS staff members do on thier profile along with a forum badge (like the blue HCS staff profile icon).
Imo, this could be something nice and be something that could be a specific supporter fund that can also possibly be used for promotion of FS. (Internet advertising/etc) as the growth of the game is something that any plausible supporter would want. (I know full well I'd donate MORE if I knew HCS would be advertising the game like they used to. HINT to HCS lolz)

Are you active? Enjoy playing FS for fun and striving for lofty goals? Looking to join a guild that invests in itself and seeks to improve and grow in all aspects of the game?
Secret Alliance can be your home in FS! We are looking for active, motivated and driven players who have a passion and genuine enjoyment of FS to join us as we continue to rise towards the TOP! If interested feel free to send me a PM.
SA is also looking for one or two guild mergers INTO SA. Feel free to ask for details.