What catalogue at what price?

Hi everyone....I am starting to list British Commonwealth and have some questions. Using Gibbons Scott and Michel
I find the prices are much higher in Gibbons.If using Gibbons what percentage of catalogue makes sense? MNH-50%
Mint=30% or some other basic formula? I realize Delcampe converts currency to euros, but do the majority of collectors use Gibbons for commonwealth?

Gibbons seems to only list values for mint items. Are they for MNH or MINT?

I appreciate your input....hope everyone is well.

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As far as Commonwealth is concerned, Gibbons is the predominant catalogue, albeit in Delcampe, because the majority of members are from Europe, no doubt catalogues such as Michel & Yvert would be common, so there is probably no right answer but I stick to Gibbons, mainly because it's easier for me to get the catalogues and I don't encounter major problems.

Gibbons pricing for mint stamps is as follows:

Up to the end of King George V reign (1936), prices are for mint lightly hinged, heavily hinged at a discount.
From King George VI on, mint prices are for MNH.

What price to sell at? - how long is a piece of string as the British saying goes.

Modern MNH - 30-50% depending on the country and its popularity. Some countries aren't much collected so sales can be difficult at any price.

Best tip is to do some background work on whatever you intend to list to see what price items are ACTUALLY selling for - in the top search bar, search for the country and if possible a date narrows the search down. Filter that search into sold items only which will give you a good idea of an average realisation.
The number of items sold will also give you a clue to whether a country is proving popular with buyers or not, but remember just because a country doesn't sell well now, it doesn't mean it won't in the future and vice versa

Thank you for your helpful reply. Very kind of you.The last question is ...what to do with mint hinged modern items which are only priced as MNH?

I would normally sell modern hinged mint at about 2/3rds of the price of MNH, providing they are clean with no missing perfs or creases and don't have a very heavy hinge mark remaining.

There is a market for these at such reduced prices. Some collectors want fresh MNH only, others are perfectly happy with a hinged stamp or set providing, as above, they are in sound condition.

For heavily hinged or otherwise marked stamps either group them together as a collection at maybe 10% or forget about them altogether.

Thank you so very much.It is very helpful for the information from you.
Hopefully we will all get through this terrible virus soon. Stay well and thank you again