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For example: The people at grant you $20 worth of promotional credit, as soon as you get the VIP status for $29.98 per month. Notice that in some cases a site will also give that extra credit even if the membership is free, because it requires a credit card number and that can indicate which users are serious and which are just time-wasters.
This option is becoming very rare in the adult webcam arena, but I will still mention it.
Many cam sites want to draw you in and offer some pretty good deals for new members.
Some time you have to purchase credits in order to receive the desired bonus and sometime you get some just for signing up as a free member.
On Sexier these are called Showtime - video chat rooms that are available for only 0.88 credits per minute, on Live Jasmin this is simply called Sale and means you'll only be paying $0.98 credits per minute and there are several more.