I am asked a fair bit from people to enter local comps, but I don't. I do enter the comps on here, only because I can see the results of the votes.
By looking at the number of members that vote on my images, I can gauge how well I'm doing with my photography. Plus the people who are voting on my images, are people I respect and admire.
With club or other comps there is only a first, second and third place. They do not tell you why you didn't win, or whether your image is average, poor or reasonable. And it can be upsetting if you think that the image you entered is a real winner, and it doesn't even get a mention.

My 2 cents worth.

Geoff.