Obviously resort location, week, and price matter, but I have found that Redweek almost always provides a good selection of properties ranging between highly competitive pricing to sometimes outstanding deals from owners looking to basically cover their MF's.
But from a marketing perspective I think one of the challenges I have noticed is that there appears to be a huge audience of potential renters / vacationers that have no idea Redweek even exists. I didn't know Redweek existed until after we bought a timeshare.
I know many at work or social circles that have the ability to travel extensively, and they do. So over the last year I have been informally polling people at lunch, dinner, or whenever the topic comes up, about where they go to book trips and vacations. A lot of answers like Booking.com, Travelocity, Orbitz, Sandals / Beaches, etc. Some use travel points they redeemed from chains like Marriott, Starwood, or Hilton. Some work directly with travel agents or realty companies.
But how many people knew about Redweek or mentioned it? Zero. Not a single person.
To emphasize that point above, just using one East Coast oceanfront destination looking at the mid-April thru mid-June period, travel sites like Orbitz, Travelocity, Booking, Expedia, etc are already either 100% booked at the best locations or what remaining inventory is left is mostly the lower quality locations or non oceanfront. That is just for the shoulder season. The same is obviously true as one gets deeper into Prime weeks.
So the demand appears to be there (already) and travelers appear to have been booking well in advance of any 45-60 day window. So why aren't more Redweek postings getting picked clean right now since the unit sizes, locations, and prices available are so attractive compared to limited availability on the name travel sites?
I am sure answers like the overall economy, time of year, etc all play a role in the OP's experience so far. But I think the biggest reason might be that while Redweek might be well known and well used inside timeshare circles, there is a huge group of travelers out there that don't know much about timeshares and don't appear to even know these properties are available to them as rentals on Redweek because they have never heard of Redweek.
And that last statement is not intended to be a singular criticism of Redweek. The same can be said of MyResortNetwork.
Shame really, because for certain locations and resorts Redweek (and MyResortNetwork) have a superior selection of properties / pricing compared to the hotel chains and other offerings in those areas.
JMO based only on my limited experience so far.