Pina,
What region are you located in? Depending on the region that might or might not be a good deal. It really depends on where you are at in the world, and how far you're willing to travel to find a good deal. I just picked up my 2007 DL650 in Ohio (I'm from PA so it was a couple hour drive) and there were several on the market with asking prices in the $2500 - $3500 range between 2005 and 2012 with various mileage and various accessories. Anything in the 2012+ body style and the price really went up (too much IMO, you can get a 2017 leftover for ~6K plus fees right now if you can find one). From what I saw though, 61K miles would have been high at $2800 for the region. In the end I was able to wait a few weeks and ran into a 2007 with 6700 miles for $3K.
In the end, when you're buying a 10+ year old bike you're really buying the mileage and condition. The two have to go hand in hand because a low mileage bike can be in worse condition than a high mileage bike depending on how it's been cared for. Using my example, 6700 miles sounded incredible when I found mine but it brought up all kinds of questions about how the bike had been cared for, how long since it was run, serviced, condition of the tank, how long has old fuel sat in it, etc. Hell... the bike still had the original 11 year old tires on it, so you know what condition those were in.
I guess what I'm saying is that the condition and maintenance is probably more important than the mileage at 61K, but, don't be afraid to offer him less than he's asking for at $2800 asking price.
That's my advice. I'm not the most knowledgeable or experienced guy here for sure, but I did just go through this same decision making process.
Good luck!