Depends on the market in your area. If houses are selling like crazy, you can probably FSBO with no problem.

If it's a sluggish market, the extra resources and experience that an agent has may make the difference between selling and sitting.

Check with other realtors and see if ALL realtors in the area charge that $10K, or if there are others that will work for a percentage of the sales price. I think around here it's 6% - 3% of that goes to the listing agent, 3% goes to the buyer's agent.