Can I write in my profile page or in item page- Info about my prices for customization of my items or someone else?
Is it allowed?
Good question. I don’t think so. It could conflict with the Envato Studio… But I’m not sure.
95% sure it is not allowed
Why not, It is allowed, nothing wrong in it
I cant understand why not allowed.
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It conflicts envato studio too
I want to provide my rates for example for people who dont want to spent time on waiting my answer
I can’t find anything related to this topic at the help center, that is why I recommend you check this with the help team here.
Please see this Help Center Article - https://help.market.envato.com/hc/en-us/articles/203039224-Item-Promotion-Guidelines
You can not promote installation and customization services on your item pages.
Hope that helps! 
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f. Promises of included installation and customization services.
You mean this?
I not promise fearter installation or customization of my item -if someone buy my item.
It is different
It means if you promise to customize or install the item if they purchase it etc. 
Because Envato earns nothing from them (your customisations). You only use their platform for your own intereset.