It really depends on the property, how it's priced and how good the rest of the offer is. Ultimately it comes down to the "net" amount the seller will receive. An offer of $250,000 without paying the buyer's closing costs is the same as an offer of $255,000 with $5,000 toward the buyer's allowable closing costs (more or less depending on some minor details).
If the buyer is hoping to net $250,000 for their home there is no reason not to accept the offer.
One minor pet peeve, we call this the seller paying the buyer's closing costs. In reality it is the buyer "financing" the closing costs through an inflated price. As long as the buyer realizes this, I'm fine presenting this when the home may appraise and the seller seems motivated.