In reply to Nick Allen:
I may be unusual in that I have done nearly all my bouldering on my own, so I am used to not having a spotter (generally, if I have partners, I am doing routes). Spotters can be great, especially when high, but generally indoors I don't tend to see the point. They are sometimes useful on awkward or overhanging moves where there is a strong possibility of an inverted fall or simply as crowd control, but generally I don't think they are required.
On the flip side, I think that learning to fall safely is a vital skill for safe bouldering, so is worth practicing.