I've asked someone to ask one of my software competitors why he should choose their software over mine prentending he was hesitating between buying one of those two.

He replied:
Dear <name>,

Thank you for your question. If you buy <our software>, we will give you a 60-day money-back guarantee. You will be able to decide if you want to switch to a foreign ebay seller at any point in time, and we will give you the money back if you think they actually add some new features that we don't have.

I don't want to compare features because it brings back bad memories because all their 'features' are copied straight from us (like 4 user accounts,
built-in web browser, etc.) [Actually I've been around longer and he's been copying my every move]

<their software> will probably continue to add features to their program--after we develop them for ours [I've had every feature before I had even heard of them]. But if you want American innovation instead of foreign rip-off artists, you are welcome to buy <our software>. Even if it costs $5 more [Actually $15 more, and it's poorly written and does much less].

To be honest with you, I don't think <their software> will last more than one more month. Mark my words. [huh? I've been selling it for far longer than they have and have over 5 times more users and sell more than 5 times more per week than they do]

Thanks,

<our software> Support
WOW, what's his problem? I've never seen such an unprofessional and attacking [the competitor] reply. Could it be that he's just jealous I sell so much more than he does? I still don't understand the very few users that still pay more for his inferior and very poorly written software (I've tried it and it's badly made, non-standard, complicated to understand, etc).