Even if you don't use them to transact, doesn't the fact that you have a full node increase the network security by itself? (as it's validating/sharing)?
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In theory, yes. If there was a shortage of reachable nodes on the network, or a shortage of nodes willing to provide the chain for bootstrapping to others, or a shortage of nodes able to quickly relay transactions. None of these services have been in shortage for years, though.
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Replying to @pwuille @Karalhoin and
It cant hurt
Besides, what about relaying, shunning, S2X and UASF? 
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Replying to @eumartinez20 @pwuille and
The shunning by non-economic nodes is irrelevant as it has no force behind it.
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Not if enough nodes do! So the others good?
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Replying to @eumartinez20 @evoskuil and
Q: How many full nodes is enough? A: One, our own. I guess to some extent, if you really can't run one yourself, you'd rather have many independent parties depend on full nodes with rules compatible with the rules you want. But really, you should use your own.
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Replying to @pwuille @eumartinez20 and
One's own full node is far more trust-minimized than an SPV node, but an SPV node that depends on the consensus of 100s of jurisdictionally diverse full nodes of others still involves much less trust than PayPal. I favor former but "might as well run PayPal" ill describes latter.
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Replying to @NickSzabo4 @pwuille and
Running a full node really only allows you to know if the chain is being 51% attacked. It doesn't actually make you any less vulnerable to such attacks (FNs are still vulnerable to double spend attacks/re-orgs). The security of both spv and full nodes relies on >50% being honest.
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Replying to @distributedbit @pwuille and
Knowing makes you less vulnerable if you have the capability to respond, e.g. by finding other correct nodes and maintaining your own un-attacked fork.
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Replying to @NickSzabo4 @distributedbit and
It's also important if you're accepting payments to know about 51% attacks so you can quickly suspend confirmations until the attack ends. Right?
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