‘Themselves suffering wrong as the reward of wrongdoing, counting it pleasure to indulge themselves in the daytime (literally ‘in a day'), spots and blemishes, revelling in their deceivings while they feast with you; having eyes full of adultery, and who cannot cease from sin; enticing unsteadfast souls; having a heart exercised in covetousness (pleonexia) having children of cursing.'
As a result of their behaviour they themselves ‘suffer wrong' as the wages of their ‘wrongdoing' (note the play on words, and compare 2 Peter 2:15). They reap what they sow. This partially looks back to 2 Peter 2:12. Their life may seem to be one round of pleasure, but they are not really happy in it. They are restless, even tormented, in spirit and the life gradually palls so that they want more and more excess.
And why do they suffer? It is precisely because their lives are one long search for pleasure. They indulge themselves in the daytime, something they are able to do because they sponge on their followers. Thus they are spots and blemishes, (contrast 2 Peter 3:14; and see 1 Peter 1:19) caricaturing Christianity, and totally unfit to offer themselves to God. (A later Christian work The Didache would later put a tight restriction on the benefits that prophets could receive). And when they enjoy their food at their followers' expense they revel even while deceiving them, while their eyes are always looking around for some woman, adulteress at heart, whom they can lead astray (they have ‘eyes full of adulteresses'). They are simply driven on by sin.
And the sad thing is that they entice along with them by means of their bait wavering Christians who are not steadfast in soul. This may well refer to the women who responded to their seducement. Or it may have in mind their general deception of weak Christians. Or indeed both. Furthermore they have ‘trained themselves in pleonexia', that is in the desire to have more of the things which a man should not even desire, let alone have. That is what all their attention is on. They are ‘children of cursing.' This may indicate that they are the kind who seek to bring down curses on others, but it is more likely that we are to see it as signifying that they themselves come under God's curses as reflected in God's Old Testament warnings (e.g. Deuteronomy 27:15-26; Deuteronomy 28). NIV thus translates as ‘they are an accursed brood.'