As djmatt says, the Angel Speed can definately cycle that fast, but can your fingers? Probably not, however 30bps also means that there are 30 windows of oppurtunity per second to get a ball off, meaning you theoretically stand more chance of achieving a high rate of fire than with a marker capped at 20bps.
Having said that, I actually managed to shoot faster on my IR3 (20bps) than I did with the Speed (30bps), but the difference is so marginal, it's probably not worth getting worked up about. Despite peoples claims, there are few people who actually consistenly manage more than 14bps in a game...