I'll take the bait and explain.
That's a rather presumptuous comment to make, based on little evidence or understanding of context. I've met around 50 women over the past 4 years, not only from online either. Around half of those have gone beyond a second date. The superficiality and small talk is quite tiresome, I don't find casual relationships fulfilling, and I want something deeper and more meaningful. Disclosing a diagnosis or not, to find that, one is going to have to put up other filters.
My logistics are complicated at the moment; I currently live in the suburbs, because of London house prices, and it has also taken some time to readjust to life after marriage. This gives me a 3-hour round commute every day. This also means that staying our late for after-work events is difficult, as there is no transport for me to get home after midnight.
I could meet someone at work, but I am senior to around 4,700 people in an organisation of 5,000 (and also on the executive advisory board) so there is a matter of propriety to consider. My job role itself is also a high profile one; a failed relationship where false allegations could me made against me has the possibility of causing embarrassment to my organisation, or ending my career.
I'm in clubs and I volunteer, and I haven't come across anyone I'm attracted to strongly enough to consider making an approach (though some people from my running club have actually approached me, albeit via the dating site). There is also the impact to consider on my existing acquaintances in those.
I could go on and on, but online dating, at the end of the day, suits me as it is efficient. To go back to my original question, I've decided disclosure is the best thing for me. What I am more concerned about now is how I go about expressing that.