We all know that when using Avios, getting around 1p is considered average-good value, anything below .5p is pointless. And buying them is different again.

Getting value from Tier Points on the other hand is subject to what value you put on various levels of status and what that status brings you.

I'm interested in what is considered worth the cost to 'buy' TPs? For example, I am currently being offered a £90 upgrade on my HBO SH fare which will get me 40TPs v the 5TPs for my Y seat. Is £2.57 / TP a good price? Now, to take this a step further, I have discovered I now need to add a hold bag to the fare at a cost of £35, meaning I would effectively be paying just £55 more to upgrade (90 - 35). This brings the TP cost down to £1.57. Is this worth it? This could make the difference at the end of March as to whether I hit Silver again or not.

At the other end of the scale, I gave up the chance of around 600 TPs by choosing a non-OW carrier to Australia last year. I saved around £2000 in fares, meaning I would have spent around £3.33/TP (and easily hit silver, which I have retained anyway). The £2K went a long way towards food, etc and I still flew in J.

I know that all answers are subjective, but interested in the views here.