If not you might be suffering from status quo bias.

Yep, that has occurred to me. Here are my excuses for not doing anything about it. (And yes, I'm aware that these could just be rationalizations for my bias. :)

1. My main email addresses are on weidai.com. It would take a lot of time to inform everyone and change my registrations on various shopping sites, etc., and I'll probably still lose a bunch of emails.
2. Lots of links to my site from other sites, which I can't change easily or at all. This wouldn't be the case if I was considering buying weidai.com today.
3. weidai.com has historically produced very high returns. Selling it and putting the money into index funds might still be an improvement from a portfolio theory perspective, but I don't think the benefits are that high (given that I already have an otherwise well-diversified investment portfolio).
4. I do have an emotional attachment to the domain now that I've owned it for so many years, so holding onto it could be considered a real preference, not just a bias.
5. If it is a bias, overcoming it takes effort, which might be more productively directed towards other goals, like writing a LW post about looking for the next tech gold rush, or thinking about meta-philosophy.