If anything, change 'probably' to 'might'. Confidence is good, but some people could take 'probably' as an imputation on their ability to comprehend the subject matter. I'd always aim at "That was just the beginning. Whip out your chequebook and then you'll REALLY see what I have to offer" rather than "You sound like you're in trouble."
Thanks for the support, but if I make an arrogant remark, I have to expect to get snarky responses, right :-)
The line was supposed to be taken as a joke, in reference to people signing off their blog posts with "If you read this far, you should probably follow me on Twitter" and the likes.
Thanks for your feedback though! I hadn't thought about how people could interpret it as a slight insult to their understanding of the subject matter, so next time I make an arrogant joke I'll try and take stuff like that into account.
Nope.