Has anyone eloped and had no guests at all?

Technically, it's only an elopement if you have no guests anyway! An elopement is when you run away to get married without telling anyone. What people refer to nowadays as an 'elopement' is basically a very small destination wedding.

As for not inviting people, in one way, it makes it easier having no guests than just having a few because you aren't upsetting anyone by leaving them out because they are ALL left out. The only caution I would have is to consider immediate family, especially parents. Friends will get over not being invited within a few weeks, but I know some parents are still feeling the hurt years on from not being at their child's wedding. So if you still have parents alive and are close to them, I would suggest at least discussing it with them and seeing how they feel.