You pay the $40 EHD enabling fee for the ViP211 ONCE for the entire account, then add as many 211's as you like with the only fee being the $7 receiver fee.
I have 3 211's with a 722k as my primary, so I pay $6 for the primary (722k) ($6 DVR fee) then $7 for each of the 211's - total fees $27/month for 4 receivers all with recording capability.
The receiver fee is really just an output fee ($7 per output) solo receiver is $7, duo receiver is $7+$7=$14. The hidden DVR fee is the $3 extra added to the output fee on DVR receivers, so the solo DVR is $7+$3=$10 and the Duo DVR is $7+$7+$3=$17.
I have 3 211's with a 722k as my primary, so I pay $6 for the primary (722k) ($6 DVR fee) then $7 for each of the 211's - total fees $27/month for 4 receivers all with recording capability.
The receiver fee is really just an output fee ($7 per output) solo receiver is $7, duo receiver is $7+$7=$14. The hidden DVR fee is the $3 extra added to the output fee on DVR receivers, so the solo DVR is $7+$3=$10 and the Duo DVR is $7+$7+$3=$17.