in the slimepit of pinks which lack the transparency of other markets the MM's do not need to state the full quantity of there intent in the bid and ask prices.
Simply put the 5k or 10k blocks you see on L2 are simply minimums, it by no means proves they only have 5k blocks to sell (but sometimes its exactly that)
it is a reflection of the lack of transparency in this market.
And is one of the tools allowed to them to maintain the corrupt market By the same token, if you place an order, they by no means are required to display it, Sometimes people do try calling in top their brokers and request that their order be displayed in the market place,
"This aint the TSE or the big board" but the one that makes me curious is this one