ALL THESE COMICS WILL BE AT HALF PRICE - THAT APPLIES EVEN AFTER THE VOLUME DISCOUNT APPLIES.
Thus if you got 2 comics at £1.80 you would get both the 50p volume discount for 7 or more (ie 7 at £1.30 each = £9.10 rather than £12.60) but also the half price deal for all those that are Image issues (so £4.55)
You are perfectly free to mix Image and other publishers' issues and you will continue to get the normal volume discounts for everything. It is just that you will also get a further 50% off for Image titles.
However, if I do this (& if its popular will try it again for other titles) it means I can no longer justify all the volume discount I used to give. The 50p discount when buying 7 back issues or more is unchanged. However instead of £1 off each when buying 20 and £1.20 off when getting 50 I am going to simplify them by making it £1 off each when buying 40 or more.
Still the best deal in the country when my base undiscounted price is lower than other shops, who don't do discounts, and don't have more than 1/3rd as many issues to choose from.