You need not be connected to all the seeds and peers for that file while downloading. It is possible that your isp has enabled nat in ur router or web distributor. If u have such a device at ur premises, let us know of its make, since different devies use different OS and hence different commands to enable port forwarding.
To see if a nat is preventing remote connections to reach you, use azureus to download a torrent and check the handy nat status icon in it. Each color will tell u about the tracker and nat. Green icon is OK while a yellow one means nat error.
One more reason for it could do with "choking" in the BT protocol. Each peer connected, including you, will have a set number of upload and download slots that can be open at a time. In addition to this, the protocol intrinsically chokes (or blocks) data requesting peers based on the client's own upload speed, the remote client's upload speed to you and other parameters.
In addition to all this, the clients themselves will have many other files that they are seeding or leaching.
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