It depends on your perspective, and the reason for purchasing. For a collector (who are an extremely cheap bunch) the price is "too high."
Buying it for sewing? You can't find a much better stitcher for piecing. If you consider what a new junk $300 Singer sells for, it's a bargain. I have one I rescued from Goodwill a couple years back for $29.00. $150 isn't anywhere close to what it's worth. $300 won't pry it from my hands either. You be the judge.