Page Object Model class structure in Selenium
Some lines may be simplified.

1) elementExists() already returns boolean, so use it directly:

return ((elementExists(by)) ? true : false);

to

return elementExists(by);


2) You may inline a method calls into condition statements:

Boolean result = accountsToRemove();
if(result == false) {

to 

if(!accountsToRemove()) {


3) Name the main test method correspondingly:

removeAccounts()

to

testRemovingAllAccounts()
userRemovesAllAccounts()