Most items that are in the Guild Market are available to all in Trade. The only item in the current Guild Market not accessible to me is Salt Enrichment which is only available if Level 62+.
This item is also available to me by getting a lootspot in an Ali Adventure. If you are making restrictions in the guild market then you should also not be allowed to either buy in trade or be allowed to get a Ali lootspot.
I say lift restrictions on ALL Guild Market items to make a level playing field.