In 2004, shared hosting with PHP/MySQL was the standard hosting package. A good quality Cpanel account at that time was about $15-$20 per month. So you've gotten an exceptionally good deal.
Around that time Dreamhost became the place to be. quickly followed by a series of lengthy outages that utterly destroyed it's reputation. Other Cpanel-powered hosts popped up, went under, merged, acquired, disappeared, reappeared, went down, never came back out.
Fast-forward to today, shared hosting is just a race-to-the-bottom barrel scraping. Margins are practically non-existent. Every kid with a bedroom computer has their own Reseller account and pretend they have their own hosting company. Pricing on that seems to be about $4 a year, but the quality is absolutely dire, and that's when the server is actually online.
Shared hosting is largely a dead industry today, it bottom-feeds because their top-end audience grew into dedicated servers, and their average and above average end customers are comfortable running their own cheap VPS. Safe in the knowledge that it's very much harder for another customer to take down everyone's website.
Shared hosting is no longer a sustainable business model. You got a great ride for your money, you got a very good deal. Now it's time to move on.
Grab yourself a VPS, and take a step up to the next curve on the online hosting technology stack. It's well past time. Good quality shared hosting, with great support is getting more and more expensive, because the market for it is dwindling down to people who can't or won't take the step up towards VPS/Dedicated servers - that means the support cost per customer rises. And that isn't a sustainable process.
If the average monthly price you paid for good quality hosting on TextDrive/Joyent is under $10 because of these packages, well done, you got a tremendously good deal. How would you have rated the service you received before you received the email/message? Think about that - consider if the support/service you received related to the per month price you've paid.
Now go out and find a web hosting offer that will give you the same quality of service, for the same monthly price - and switch to that. I get a feeling, apart from special offers that will surface because of this, you'll be hard-pressed to find an equivalent.
But seriously people, "lifetime" and "unlimited" are the two emptiest words in the language of web resource offers. You know that. I'd feel sad for you if you only got 1 years hosting for your $200 for such features.
But if you got 8 years for your initial outlay, and you still feel you deserve more... that's a text-book example of bottom-feeding. Quite the sort of customer a web hosting company wouldn't miss.
A class action? That would be amusing.