It seems like different items can't be used to gain different amounts 1 item from the market.

Example of what I'm trying to do in the json:
"custom entries": {
"__comment": "You can define additional items to be sold by the Market here. Defaults can be overridden. Prefix with ! to blacklist instead.",
"64contenttweaker:rak_coin": "contenttweaker:caz_metal:0",
"48contenttweaker:rak_coin": "contenttweaker:bear_metal:0",
"32contenttweaker:rak_coin": "contenttweaker:sey_metal:0",
"16contenttweaker:rak_coin": "contenttweaker:og_metal:0"
}

Only the last one actually shows up.