EDITED 2019-02-08

`maxTxFee` is a global variable, used by both the raw transaction and wallet RPCs. It's set from `-maxtxfee`.

~listed in the global help text in init.cpp, but is only set in `WalletInit::ParameterInteraction()`. If the wallet is disabled, then `-maxtxfee` is ignored and the default is used.~

~This behaviour has existed since the mempool was changed to limit acceptance based on `maxTxFee` in https://github.com/bitcoin/bitcoin/commit/fa331db68bcc68e4c93fb45aaa30f911b0ecfe1a.~

~Short-term fix is to move the `-maxtxfee` handling to `InitParameterInteraction()` in init.cpp.~
EDIT: `maxTxFee` initiation bug fixed in #15357 

I don't think we should share this setting between the node and wallet.
pcoinscatcher.reset(new CCoinsViewErrorCatcher(pcoinsdbview.get()));
                
                
                if (!pcoinsdbview->Upgrade()) {
                    strLoadError = _("Error upgrading chainstate database");
                    break;
                }
                
                if (!ReplayBlocks(chainparams, pcoinsdbview.get())) {
                    strLoadError = _("Unable to replay blocks. You will need to rebuild the database using -reindex-chainstate.");
                    break;
                }
                
                pcoinsTip.reset(new CCoinsViewCache(pcoinscatcher.get()));
                bool is_coinsview_empty = fReset || fReindexChainState || pcoinsTip->GetBestBlock().IsNull();
                if (!is_coinsview_empty) {
                    
                    if (!LoadChainTip(chainparams)) {
                        strLoadError = _("Error initializing block database");
                        break;
                    }
                    assert(chainActive.Tip() != nullptr);
                }
                if (!fReset) {
                    
                    
                    
                    uiInterface.InitMessage(_("Rewinding blocks..."));
                    if (!RewindBlockIndex(chainparams)) {
                        strLoadError = _("Unable to rewind the database to a pre-fork state. You will need to redownload the blockchain");