There's a reason why stuff gets updated over time and that would be to balance out content and create content to keep things interesting. Creating a classic server would mean you wouldn't be updating any issues that occurred over the timespan between now and when the classic server takes place. It would mean all the convenient updates we've received on the "regular" servers wouldn't take place on the classic ones.

If the only reason is experience points that a classic server should be made, then I'll gladly pass on the offer since I've killed enough crabs in my life.