There are a lot of recruiters on the market. But it's really no different than the market for lawyers; the median lawyer is a very poor man but the average lawyer is rich.
If they can't put a number on the table, they are probably one of those that tries to run a volume game, which I think is a bad approach for engineering. Basically spamming and not giving any info until they get their quotas.
The good ones want you to get hired at a good price because they are often paid a commission on your salary. And the great ones want to keep in touch so they can cash out again once you get bored with your current job. But the spammy one will have moved on to selling used cars at this point.