I REALLY hate ads on web-based gmail client, but I suppose they are a necessary evil.
The an ads-removing feature send the wrong message.
I may buy (or donate for) a gmail-client-enhancer.
I may buy (or donate for) an ad-remover plugin (well, I already use ABP and ghostery, and donated for the former)
But I wouldn't give money for a gmail-specific ad-remover, that doesn't feel right (even if I am using ABP, maybe the 'specific' part?)
I may be wrong, but distributing it at two separate plug-ins may be better.
Removing the "ad-removing" part would be the easiest way, because interested people almost all already have ad-blocker.
Even if you chose to let it in, not making it a major marketing point would be smarter. just let it there as an option (activated by default or not, I don't know).
PS: Attachment icons would be real nice, though, I love that feature.
PS2: Yes, I know, using ABP and not wanting to pay for that app because of this feature sounds like hypocrisy, in fact it is, but that's how I thought about it (I have build-in hypocrisy), and I may not be the only one.
I don't disagree with those of you who were a bit surprised to find this application blocks all ads indiscriminately. I also find Google's ads to be the least intrusive on the block. One need only login to Yahoo! Mail to realize how unobtrusive Google's ads are.
A major issue would be the migration of your data from your private Google account to a Google Apps account. There is no direct migration path, you basically have to download all your data and upload it again. If you have a high number of mails, it might take weeks since download/upload are rate-limited.
Interested parties will probably already be using free software to remove ads across the web, but you have a problem with this free software that removes ads only in gmail and provides a ton of other neat features? Adblock asks for donations too -- https://adblockplus.org/en/contribute.
But why hidding /removing the ads in gmail feel wrong? Because they are not too visible. The only bad/intrusive part of gmail ads is the mail parsing to select which ad will be shown. I have no proof, but I strongly suspect this will be done even if I hide them, so nothing to win there.
In regards to what we are giving in exchange for the free service, there's all sorts of tracking activity, contact and content mining, and general Google account-related user information that we share with Google in order to feed Google's database.
Google aims to feed its database to improve its products and make its products more attractive to partners. Ads in Gmail are only part of the story of how Google gets rich from your stream of personal data. A few ads shown on the Gmail interface is not how Google is making its billions.
IIRC, there is an option in gmelius to opt for a GMail style of MS-style icon for attachments.