Update: Read this follow up post - offer actually turns out to be epic win.

Today I received the following ultimatum from Streetcar:
As one of our Founder Members, your support has been crucial to growing our car club. Last year we joined forces with Zipcar to create the world’s leading car club and very soon the best-of-both services will be launched under the Zipcar name, giving you access to more cars and vans across the UK and North America. As one of the first to embrace the car club concept in London, I would now like to warmly welcome you to Zipcar.
As a reward for your loyalty and custom over the years, we’re inviting you to convert your Founder Member deposit to free lifetime membership of Zipcar and driving credit of £150 (valid for 9 months) to get you started. To take us up on our offer please reply to my team by 22nd September 2011 and they’ll activate your new account. By accepting the offer your deposit will no longer be refundable and will be exchanged for Zipcar lifetime membership and £150 driving credit.
If for some reason you decide not to take us up on the offer of lifetime membership, you may switch to become a standard member paying an annual fee and have your deposit returned upon your switch to the standard membership. The two billing systems will be moving over to one shortly, so we can only hold this offer until 22nd September 2011. Please let us know either way by then.
These “special offers” have started to come out once a year. This one in particular is very disingenuous. For starters, the deposit that I paid to Streetcar four years ago, that they’ve been earning interest off (ok, admittedly not much now) - was for £250.
So in effect, Streetcar are taking £100 of my money to keep the status quo… or rewarding me, to use their words.
I really like Streetcar - they have an excellent service, however I find these ultimatums very dishonest. They don’t even mention the deposit stake that you’ve paid to them. I only learnt that it was £250 (not £150 as I’d assumed) from a tweet. And taking £100 from my deposit in return for the status quo is not a reward - it’s a penalty.
I’ve received other offers like this from Streetcar in the past. In 2010 and 2009 I had similar offers like this one.
In 2009, you received an offer from us to convert your membership type from Founder Member to standard Streetcar Member. We didn’t hear from you at the time and just wanted to let you know that the offer still remains open to you now.
To recap on the offer:
Convert to an annual membership
Receive £200 in free driving credit (valid for 9 months)
Start paying annual membership fees after 2 years (currently £59.50 per year)
We’re also adding in an alternative option:
Receive £250 in free driving credit (valid for 9 months)
Start paying annual membership fees after 1 year
Remember that if you do take either option, were you to leave you would no longer receive a refund of the deposit you paid when you first joined.
None of these options is particularly appealing.