Renewal Pricing vs Bundle Pricing

I am confused about your pricing and would like clarification. I have been with stackideas for a couple years now. I was looking back over my purchases and saw that renewal rates are 10% off, but that they can't be purchased as a bundle. I added up the cost of purchasing professional bundle ala carte and it comes to $193 less 10% renewal discount brings it to $173.70

I then look at the purchase of that bundle for new customers and see that it is $158.

Am I not understanding something? Why would a current customer be charged more to renew?

So then I am looking at Christmas special of 30% which would bring the bundle down to $110.60. This is the obvious winner, but does the active period get added on to the end of my current paid subscription or does it reset subscriptions to today?

Thanks in advance. Aside from this confusion, you are great and your support is always a pleasure to work with.