These tritium service dials are actually quite rare, even if they’re usually overlooked. Some of them age very gracefully, and I’ve ended up with a small collection myself. I enjoy them for what they are: original, contemporary Omega service replacements. They typically sell for around $200–400.
With that in mind, price becomes absolutely crucial. I’d agree with the general view that collectors will simply walk away if the watch is priced on the same level as one with an original dial. In this case, I would value the watch as if it had no dial at all. A correct original dial, even in modest condition, is going to cost somewhere in the region of $2,000–3,000. I would also deduct another $1,000 for contingencies - because until that service dial is off, none of us knows exactly what we’re going to find underneath. And even if you go into the market with $3,000 in your pocket, it’s still unpredictable when a good dial will surface, and whether it will actually be attractive enough when it does.
So a sensible collector might only be interested at a price that reflects all of that. In reality, most sellers of watches with service dials tell me to take a hike when I make an offer based on these calculations. But I don’t see why I should pay more, given the time, risk, and cost involved in making the watch right.
The price indicated in the thread might be reasonable if the original dial were present and in good shape (though many would still debate that, given the condition), even allowing for the case and the bezel. With a service dial, it’s simply higher than I think any knowledgeable buyer would bid.