You can mount the raw block files (blk*/rev*) in a single read‑only --blocksdir, but LevelDB’s chainstate is read‑write and lock‑protected, so every extra node still needs its own 10–12 GB chainstate, its peers/mempool logs, about 250–350 MB of RAM, and a slice of CPU for validation; scale that by 100 and you’re looking at roughly 1.2 TB of fast SSD, 25–35 GB of RAM, sustained high IOPS, and near‑gigabit bandwidth—resources that push a real‑world cloud bill into the hundreds of dollars per month, well beyond the “$50 for 100–200 fully validating nodes” target.