Mass container imports have increased in the last 1-2 years. In fact, I had to change my business to cater for the second hand DMD demand. I'd say in the last 5 years, demand has not been higher for quality, restored machines. Prices have increased, but workmanship has declined. Repairs have increased in the last 12 months.
NIB Sterns have stalled mainly due to price, and many are waiting for the pre order boutique games to be released as their cash is tied up on these games. I know 2 Stern LE buyers that love their TWD LE, but it was their last LE game.
This time of year is always quiet - people coming off holiday mode and start saving again. I think most NIB are waiting for the next few titles and a price drop before (if) they start buying again. The second hand market is still doing well - but this is traditionally a slow period.