Add additional people for Event-style bookings without having to create multiple price bands or Extras

On the Price Band selection screen, I would like customers to be able to click a + or - button to increase or decrease the number of people they are booking.

E.g. I have an event and the ticket option is £25.

Currently I either have to create a Price Band each for 1 person for £25, 2 for £50, 3 for £75 etc

Or I create a Price Band for 1 person at £25, and add an Extra for extra people at £25 each

The option to increase the number of tickets with a + or - would make this process slicker.