Unbelievable...Talk about overselling something.
I did not pay good money to have your advertising, an irritating embedded nag to purchase more...
Then when someone comes in and asks to have it removed you employ that it is somewhat necessary in order to prevent plugin conflict. My question to that is why?
It would appear this is only a marketing gimic, period. Why would you build a plugin that requires this. A plugin should stand on it's own.
Then to add insult to injury you suggest using yet another plugin to remove the second plugin? So to install your e-newsletter plugin I need two others installed.
I am sure that others see this as I do.
I will be requesting a refund, will not use any of your plugins again, and will be sure to write an article out to all 5000 of our members to avoid using WPMU plugins on there blogs.
Unless of course they do not mind paying to be irritated.